Attemp to fix build bot:

http://lab.llvm.org:8011/builders/lld-x86_64-darwin13/builds/25329/steps/build_Lld

llvm-svn: 276789

lld/ELF/LinkerScript.cpp

@@ -774,6 +774,8 @@ static uint64_t getSymbolValue(StringRef S) {
     if (SymbolBody *B = Symtab<ELF64BE>::X->find(S))
       return B->getVA<ELF64BE>();
     break;
+  default:
+    fatal("unsupported target");
   }
   error("symbol not found: " + S);
   return 0;